What was found
(CAN) DURING A 300 HOUR INSPECTION, DIS-ASSEMBLY OF THE TAIL ROTOR , THE ENGINEER EXPERIENCED DIFFICULTY REMOVING THE TAIL ROTOR TO SHAFT ATTACHMENT BOLT. UPON REMOVAL OF THE BOLT AND INSPECTION OF THE T/R ASSY. THE ENGINEER DISCOVERED THAT THERE WAS CONSIDERABLE AMOUNT OF CORROSION ON THE LAMELLAR PACK ASSY. CORROSION WAS FOUND ON THE INTERNAL BORE AND PIVOT POINT. LAMELLAR PACK ASSY WAS REPLACED, ATTACHMENT BOLT CLEANED/REUSED AND TAIL ROTOR ASSEMBLY REINSTALLED. THE U/S UNIT WAS RETURNED TO OTTAWA DEPOT 042 STORES FOR FURTHER INSPECTION AND ACTION.